Hitachi Chemical Company, Ltd.

Hiromasa Kawai

Fumiaki Kanega

Minoru Suzuki

Yutaka Hosoi

Takayuki Saito

Akihiro Kobayashi

Akihiro Sasaki

Toshiyasu Kawai

Toshiyuki Fujita

Hideaki Shibata

Yasuhiro Koike

Yoshiyuki Mukoyama

Toshio Akima

Hatuo Sugitani

Takashi Morinaga

Akihiro Yoshida

Takeo Kudo

Yoshinobu Ogawa

Mitsuharu Kato

Hiromu Miyajima

Kiyomi Sugawara

Futoshi Oikawa

Takaaki Okinaka

A photocurable resin composition including: (A) a urethane (meth)acrylate oligomer having a polyoxyalkylene structure, (B) a (meth)acrylic polymer, (C) a (meth)acrylic monomer, and (D) a photopolymerization initiator, wherein the component (A) is produced using monomer components including (a1) a polyoxyalkylene polyol, (a2) a polyisocyanate, and (a3) a hydroxyl group-containing mono(meth)acrylate compound, a relationship N (=n1/n2) between the total mass n1 of the monomer components and the total equivalent weight n2 of acryloyl groups within the all monomer components is 4,000 or greater, and the component (A) is substantially free of unreacted isocyanate groups.

Photocurable resin composition and cured product of same, resin sheet and production method for same, and display device

Process for the preparation of non-birefringent optical resin and optical elements made by using the resin prepared by the process

A transparent resin obtained by polymerizing a monomer having an alkylene oxide group, a polyfunctional (meth)acrylate having a divalent branched hydrocarbon group and other copolymerizable vinyl monomer, if necessary, is suitable as an elementary material for a plastic lens with excellent heat resistance and hue.

Transparent resin and plastic lens

Plastic lens

A transparent resin obtained by polymerizing styrene, a methacrylic or acrylic acid ester, a polyfunctional monomer, and if necessary a copolymerizable vinyl monomer in the presence of a molecular weight modifier is suitable for producing a polymer lens having a low specific gravity, and excellent in transparency, edging ability with other good properties.

Resin for plastic lens

An optical resin obtained by polymerizing 97 to 50% by weight of methyl methacrylate, 3 to 30% by weight of an N-substituted maleimide, and 0 to 40% by weight of an unsaturated monomer by suspension polymerization at a pH of 5.5 to 7.5 is excellent in heat resistance and transparency.

Process for producing poly methyl methacrylate/N-substituted maleimide

An optical resin material comprising a polymer containing as an essential component at least one norbornyl acrylate or methacrylate or a derivative thereof is excellent in properties, particularly in moisture resistance and can be used for molding optical elements such as lenses, optical discs, etc.

Lens and optical disc base plate obtained from copolymer of norbornyl

Optical resin material

A polymer obtained by polymerizing tricyclo[5.2.1.0.sup.2,6 ]deca-8-yl acrylate or methacrylate in an amount of 100-5% by weight with one or more copolymerizable unsaturated monomers in an amount of 0 to 95% by weight is excellent in transparency, moisture resistance, and heat resistance and is suitable as a material for optical elements.

Polymers of tricyclo[5.2.1.0.sup.2,6 ]deca-8-yl (meth)acrylate

An expandable styrene series resin composition comprising a styrene series resin containing in its molecular structure a group of the formula:

Expandable styrene series resin composition and process for production

Growing community of inventors

Ichihara, Japan

Hiromasa Kawai